Alex, There is nothing wrong with that. If you gdal_translate a TIF to BMP the projection/reference will be stored on a .bmp.aux.xml. The question is, why in the process of creating those BMP and JPG the auxiliary files are not been created.
Regards, Ivan > -------Original Message------- > From: alex <[email protected]> > Subject: [gdal-dev] GDALGetProjectionRef(...) problem on filetype JPEG and > BMP > Sent: Sep 17 '09 06:44 > > Good day. > I encountered the following problem using GDAL. GDALGetProjectionRef(...) > works with file formats TIF, but JPG and BMP returns an empty string. > > Used as: > There have been downloaded sources from > http://download.osgeo.org/gdal/gdal162.zip > Sources was built using Visual Studio 2005, the utility nmake, using the > command line interface. > Then was opened raster map file with format MapInfo by my program. MapInfo > file was created by using the export map function of the MapInfo program. > > I used the C API library GDAL. In the body of the program: > > GDALDatasetH pDataset = GDALOpen("map_filename", GA_ReadOnly); > > and > > GDALGetGeoTransform(...) and GDALRasterIO(...) > > Then I opened the map file and exported part of it to coordinatesof I > needed. > It worked with the map file format map_filename.tif + map_filename.tab, > map_filename.jpg + map_filename.tab,map_filename.bmp + map_filename.tab. > > Then I could to get access to the map coordinates in the format .TIF using > the function: > > GDALGetProjectionRef(pDataset) > > which returned the projection maps of the form <wkt format projection > string>, as was intended. > > But when opening files type .JPG and .BMP > > GDALGetProjectionRef (pDataset) > > returns an empty string "". > I think that the library is somehow obtains a coordinate system maps, > because > GDALGetGeoTransform (...) work. > > Please specify how i can get a system of map coordinates for these files > are JPG and BMP and import it into an object of class OGRSpatialReference. > > I apologize for my poor language skills. > Thank you. > > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev > _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
